diff --git a/lib/tfw/networking/server/zmq_websocket_handler.py b/lib/tfw/networking/server/zmq_websocket_handler.py
index b16796c..cf79129 100644
--- a/lib/tfw/networking/server/zmq_websocket_handler.py
+++ b/lib/tfw/networking/server/zmq_websocket_handler.py
@@ -32,6 +32,9 @@ class ZMQWebSocketHandler(WebSocketHandler):
         log.debug('Received on WebSocket: {}'.format(message))
         self.send_message(*self.make_response(json.loads(message)))
 
+    def make_response(self, message):
+        raise NotImplementedError
+
     def send_message(self, message: dict, key: str = None):
         self._event_handler_connector.send_message(message, key)